【摘要】：選取三峽庫(kù)區(qū)砂、泥巖顆粒料作為研究對(duì)象,進(jìn)行在荷載及干濕循環(huán)組合作用下的滲透固結(jié)試驗(yàn)及顆粒篩分試驗(yàn)。選取上覆荷載、土體干密度、粗顆粒含量為試驗(yàn)的影響因素。采用自制的顆粒破碎細(xì)觀試驗(yàn)系統(tǒng),試驗(yàn)系統(tǒng)由有機(jī)玻璃試驗(yàn)桶、上游供水裝置、下游出水裝置、熱氣源進(jìn)氣裝置、砝碼、量測(cè)設(shè)備(上下水頭測(cè)壓管、百分表、下游集水箱、高精度試驗(yàn)天平)組成。通過(guò)對(duì)試驗(yàn)數(shù)據(jù)進(jìn)行分析比對(duì),獲得的結(jié)論及研究成果有:(1)在干濕循環(huán)作用下,研究干密度、上覆荷載、粗顆粒含量對(duì)泥巖顆粒料的影響,總結(jié)了干濕循環(huán)條件下泥巖滲透特性及固結(jié)特性的變化規(guī)律。岸坡土體滲透特性的變化,必然會(huì)對(duì)岸坡滲流場(chǎng)產(chǎn)生影響,通過(guò)分析岸坡深度為0.5m、1m、2m、3m的土層滲透系數(shù)的變化,揭示了滲透特性演化對(duì)岸坡穩(wěn)定性的影響�；谀鄮r土樣的空隙比和滲透系數(shù)的變化,利用Kozeny-Carman公式揭示了泥巖顆粒崩解破碎的破碎機(jī)理。在干濕循環(huán)效應(yīng)下,泥巖同時(shí)受到固結(jié)作用和破碎作用的影響,試驗(yàn)前期以固結(jié)作用為主,當(dāng)主固結(jié)作用的完成后則以顆粒破碎作用為主。(2)通過(guò)對(duì)滲透固結(jié)試驗(yàn)結(jié)束后的泥巖顆粒料進(jìn)行篩分,比較試驗(yàn)前后泥巖顆粒料各粒徑組的顆粒含量變化的情況,發(fā)現(xiàn)2~5mm是顆粒含量增加最多的粒組,將2~5mm作為特征粒徑組,衡量粗顆粒的破碎性能。采用hardin破碎勢(shì)Bp對(duì)試驗(yàn)前后的泥巖顆粒級(jí)配進(jìn)行量化,研究了在干濕循環(huán)效應(yīng)下,干密度、上覆荷載、粗顆粒含量對(duì)泥巖顆粒料破碎程度的影響。基于熵增原理,使用基礎(chǔ)熵NB對(duì)泥巖顆粒級(jí)配進(jìn)行量化,建立泥巖顆粒組成演化模型,并對(duì)滲透系數(shù)K與基礎(chǔ)熵NB進(jìn)行擬合,發(fā)現(xiàn)滲透系數(shù)K與基礎(chǔ)熵NB之間具有良好的相關(guān)性,則可通過(guò)土體滲透系數(shù)變化反映顆粒在干濕循環(huán)作用下的破碎情況(3)對(duì)在水位反復(fù)升降的情況下砂泥巖質(zhì)岸坡滲流穩(wěn)性進(jìn)行討論,發(fā)現(xiàn)隨著水位升降次數(shù)的增加,砂泥巖混合料孔隙平均粒徑Do逐漸減小,小于混合料孔隙平均粒徑Do的顆粒含量不斷增加。建立了基礎(chǔ)熵NB與小于土體平均孔隙直徑的細(xì)顆粒含量的關(guān)系模型,提出了通過(guò)基礎(chǔ)熵NB預(yù)測(cè)砂泥質(zhì)岸坡發(fā)生滲透破壞的方法,揭示了粒組演化對(duì)碼頭岸坡滲流穩(wěn)定性的影響。
[Abstract]:Sand and mudstone granular materials in the three Gorges reservoir area were selected as the research object. The osmotic consolidation test and particle screening test were carried out under the combined action of load and dry-wet cycle. Overburden load, soil dry density and coarse particle content were selected as the influencing factors. The test system is composed of plexiglass test barrel, upstream water supply device, downstream outlet device, hot air intake device, weight, measuring equipment (up and down water head pressure measuring pipe, percentile, downstream water collecting tank, etc.) High precision test balance. Through the analysis and comparison of test data, the conclusions and results obtained are as follows: (1) under the action of dry-wet cycle, the effects of dry density, overburden load and coarse particle content on mudstone pellets are studied. The changes of permeability and consolidation characteristics of mudstone under dry and wet circulation are summarized. The change of soil permeability characteristics will inevitably affect the seepage field on the bank slope. By analyzing the change of soil permeability coefficient with a depth of 0.5 m ~ 1 m ~ 2 m ~ 3 m, this paper reveals the influence of the evolution of seepage characteristics on the stability of bank slope. Based on the variation of void ratio and permeability coefficient of mudstone samples, the mechanism of mudstone particle disintegration and breakup is revealed by using Kozeny-Carman formula. Under the effect of dry-wet cycle, mudstone is affected by consolidation and fragmentation at the same time. After the completion of the main consolidation process, the effect of particle fragmentation is dominant. (2) by screening the mudstone particles after the osmotic consolidation test, the particle content changes of each particle group of mudstone particles before and after the experiment are compared. It was found that 2~5mm was the group with the largest increase in particle content. 2~5mm was used as the characteristic particle size group to evaluate the crushing property of coarse particles. The particle gradation of mudstone before and after the test was quantified by hardin breakage potential Bp, and the effects of dry density, overburden load and coarse particle content on the crushing degree of mudstone particles were studied under the dry and wet cycle effect. Based on the principle of entropy increase, the basic entropy NB is used to quantify the gradation of mudstone particles, and the evolution model of mudstone particle composition is established, and the permeability coefficient K is fitted to the basic entropy NB. It is found that there is a good correlation between the permeability coefficient K and the basic entropy NB. The change of soil permeability coefficient can reflect the fragmentation of grain under the action of dry and wet circulation. (3) discuss the seepage stability of sandy and mudstone bank slope under the condition of repeated rise and fall of water level, and find that the seepage stability of sandy mudstone bank slope increases with the increase of water level rise and fall times. The average pore diameter Do of sand mudstone mixture decreases gradually, and the particle content of Do smaller than the average pore diameter of the mixture is increasing. The relationship model between basic entropy NB and fine particle content smaller than the average pore diameter of soil is established. A method of predicting seepage failure of sandy and muddy bank slope by foundation entropy NB is proposed, and the influence of grain group evolution on seepage stability of wharf bank slope is revealed.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU45

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